/*
 * jQuery.splitter.js - two-pane splitter window plugin
 *
 * version 1.51 (2009/01/09) 
 * 
 * Dual licensed under the MIT and GPL licenses: 
 *   http://www.opensource.org/licenses/mit-license.php 
 *   http://www.gnu.org/licenses/gpl.html 
 */

/**
 * The splitter() plugin implements a two-pane resizable splitter window.
 * The selected elements in the jQuery object are converted to a splitter;
 * each selected element should have two child elements, used for the panes
 * of the splitter. The plugin adds a third child element for the splitbar.
 * 
 * For more details see: http://methvin.com/splitter/
 *
 *
 * @example $('#MySplitter').splitter();
 * @desc Create a vertical splitter with default settings 
 *
 * @example $('#MySplitter').splitter({type: 'h', accessKey: 'M'});
 * @desc Create a horizontal splitter resizable via Alt+Shift+M
 *
 * @name splitter
 * @type jQuery
 * @param Object options Options for the splitter (not required)
 * @cat Plugins/Splitter
 * @return jQuery
 * @author Dave Methvin (dave.methvin@gmail.com)
 */
 ;(function($){
 
 $.fn.splitter = function(args){
  args = args || {};
  return this.each(function() {
    var zombie;    // left-behind splitbar for outline resizes
    function startSplitMouse(evt) {
      if ( opts.outline )
        zombie = zombie || bar.clone(false).insertAfter(A);
      panes.css("-webkit-user-select", "none");  // Safari selects A/B text on a move
      bar.addClass(opts.activeClass);
      A._posSplit = A[0][opts.pxSplit] - evt[opts.eventPos];
      $(document)
        .bind("mousemove", doSplitMouse)
        .bind("mouseup", endSplitMouse);
    }
    function doSplitMouse(evt) {
      var newPos = A._posSplit+evt[opts.eventPos];
      if ( opts.outline ) {
        newPos = Math.max(0, Math.min(newPos, splitter._DA - bar._DA));
        bar.css(opts.origin, newPos);
      } else 
        resplit(newPos);
    }
    function endSplitMouse(evt) {
      bar.removeClass(opts.activeClass);
      var newPos = A._posSplit+evt[opts.eventPos];
      if ( opts.outline ) {
        zombie.remove(); zombie = null;
        resplit(newPos);
      }
      panes.css("-webkit-user-select", "text");  // let Safari select text again
      $(document)
        .unbind("mousemove", doSplitMouse)
        .unbind("mouseup", endSplitMouse);
    }
    function resplit(newPos) {
      // Constrain new splitbar position to fit pane size limits
      newPos = Math.max(A._min, splitter._DA - B._max, 
          Math.min(newPos, A._max, splitter._DA - bar._DA - B._min));
      // Resize/position the two panes
      bar._DA = bar[0][opts.pxSplit];    // bar size may change during dock
      bar.css(opts.origin, newPos).css(opts.fixed, splitter._DF);
      A.css(opts.origin, 0).css(opts.split, newPos).css(opts.fixed,  splitter._DF);
      B.css(opts.origin, newPos+bar._DA)
        .css(opts.split, splitter._DA-bar._DA-newPos).css(opts.fixed,  splitter._DF);
      // IE fires resize for us; all others pay cash
      if ( !$.browser.msie )
        panes.trigger("resize");
    }
    function dimSum(jq, dims) {
      // Opera returns -1 for missing min/max width, turn into 0
      var sum = 0;
      for ( var i=1; i < arguments.length; i++ )
        sum += Math.max(parseInt(jq.css(arguments[i])) || 0, 0);
      return sum;
    }
    
    // Determine settings based on incoming opts, element classes, and defaults
    var vh = (args.splitHorizontal? 'h' : args.splitVertical? 'v' : args.type) || 'v';
    var opts = $.extend({
      activeClass: 'active',  // class name for active splitter
      pxPerKey: 8,      // splitter px moved per keypress
      tabIndex: 0,      // tab order indicator
      accessKey: ''      // accessKey for splitbar
    },{
      v: {          // Vertical splitters:
        keyLeft: 39, keyRight: 37, cursor: "e-resize",
        splitbarClass: "vsplitbar", outlineClass: "voutline",
        type: 'v', eventPos: "pageX", origin: "left",
        split: "width",  pxSplit: "offsetWidth",  side1: "Left", side2: "Right",
        fixed: "height", pxFixed: "offsetHeight", side3: "Top",  side4: "Bottom"
      },
      h: {          // Horizontal splitters:
        keyTop: 40, keyBottom: 38,  cursor: "n-resize",
        splitbarClass: "hsplitbar", outlineClass: "houtline",
        type: 'h', eventPos: "pageY", origin: "top",
        split: "height", pxSplit: "offsetHeight", side1: "Top",  side2: "Bottom",
        fixed: "width",  pxFixed: "offsetWidth",  side3: "Left", side4: "Right"
      }
    }[vh], args);

    // Create jQuery object closures for splitter and both panes
    var splitter = $(this).css({position: "relative"});
    var panes = $(">*", splitter[0]).css({
      position: "absolute",       // positioned inside splitter container
      "z-index": "1",          // splitbar is positioned above
      "-moz-outline-style": "none"  // don't show dotted outline
    });
    var A = $(panes[0]);    // left  or top
    var B = $(panes[1]);    // right or bottom

    // Focuser element, provides keyboard support; title is shown by Opera accessKeys
    var focuser = $('<a href="javascript:void(0)"></a>')
      .attr({accessKey: opts.accessKey, tabIndex: opts.tabIndex, title: opts.splitbarClass})
      .bind($.browser.opera?"click":"focus", function(){ this.focus(); bar.addClass(opts.activeClass) })
      .bind("keydown", function(e){
        var key = e.which || e.keyCode;
        var dir = key==opts["key"+opts.side1]? 1 : key==opts["key"+opts.side2]? -1 : 0;
        if ( dir )
          resplit(A[0][opts.pxSplit]+dir*opts.pxPerKey, false);
      })
      .bind("blur", function(){ bar.removeClass(opts.activeClass) });
      
    // Splitbar element, can be already in the doc or we create one
    var bar = $(panes[2] || '<div></div>')
      .insertAfter(A).css("z-index", "100").append(focuser)
      .attr({"class": opts.splitbarClass, unselectable: "on"})
      .css({position: "absolute",  "user-select": "none", "-webkit-user-select": "none",
        "-khtml-user-select": "none", "-moz-user-select": "none"})
      .bind("mousedown", startSplitMouse);
    // Use our cursor unless the style specifies a non-default cursor
    if ( /^(auto|default|)$/.test(bar.css("cursor")) )
      bar.css("cursor", opts.cursor);

    // Cache several dimensions for speed, rather than re-querying constantly
    bar._DA = bar[0][opts.pxSplit];
    splitter._PBF = $.boxModel? dimSum(splitter, "border"+opts.side3+"Width", "border"+opts.side4+"Width") : 0;
    splitter._PBA = $.boxModel? dimSum(splitter, "border"+opts.side1+"Width", "border"+opts.side2+"Width") : 0;
    A._pane = opts.side1;
    B._pane = opts.side2;
    $.each([A,B], function(){
      this._min = opts["min"+this._pane] || dimSum(this, "min-"+opts.split);
      this._max = opts["max"+this._pane] || dimSum(this, "max-"+opts.split) || 9999;
      this._init = opts["size"+this._pane]===true ?
        parseInt($.curCSS(this[0],opts.split)) : opts["size"+this._pane];
    });
    
    // Determine initial position, get from cookie if specified
    var initPos = A._init;
    if ( !isNaN(B._init) )  // recalc initial B size as an offset from the top or left side
      initPos = splitter[0][opts.pxSplit] - splitter._PBA - B._init - bar._DA;
    if ( opts.cookie ) {
      if ( !$.cookie )
        alert('jQuery.splitter(): jQuery cookie plugin required');
      var ckpos = parseInt($.cookie(opts.cookie));
      if ( !isNaN(ckpos) )
        initPos = ckpos;
      $(window).bind("unload", function(){
        var state = String(bar.css(opts.origin));  // current location of splitbar
        $.cookie(opts.cookie, state, {expires: opts.cookieExpires || 365, 
          path: opts.cookiePath || document.location.pathname});
      });
    }
    if ( isNaN(initPos) )  // King Solomon's algorithm
      initPos = Math.round((splitter[0][opts.pxSplit] - splitter._PBA - bar._DA)/2);

    // Resize event propagation and splitter sizing
    if ( opts.anchorToWindow ) {
      // Account for margin or border on the splitter container and enforce min height
      splitter._hadjust = dimSum(splitter, "borderTopWidth", "borderBottomWidth", "marginBottom");
      splitter._hmin = Math.max(dimSum(splitter, "minHeight"), 20);
      $(window).bind("resize", function(){
        var top = splitter.offset().top;
        var wh = $(window).height();
        splitter.css("height", Math.max(wh-top-splitter._hadjust, splitter._hmin)+"px");
        if ( !$.browser.msie ) splitter.trigger("resize");
      }).trigger("resize");
    }
    else if ( opts.resizeToWidth && !$.browser.msie )
      $(window).bind("resize", function(){
        splitter.trigger("resize"); 
      });

    // Resize event handler; triggered immediately to set initial position
    splitter.bind("resize", function(e, size){
      // Custom events bubble in jQuery 1.3; don't Yo Dawg
      if ( e.target != this ) return;
      // Determine new width/height of splitter container
      splitter._DF = splitter[0][opts.pxFixed] - splitter._PBF;
      splitter._DA = splitter[0][opts.pxSplit] - splitter._PBA;
      // Bail if splitter isn't visible or content isn't there yet
      if ( splitter._DF <= 0 || splitter._DA <= 0 ) return;
      // Re-divvy the adjustable dimension; maintain size of the preferred pane
      resplit(!isNaN(size)? size : (!(opts.sizeRight||opts.sizeBottom)? A[0][opts.pxSplit] :
        splitter._DA-B[0][opts.pxSplit]-bar._DA));
    }).trigger("resize" , [initPos]);
  });
};

})(jQuery);